package org.bouncycastle.shaded.crypto;
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/**
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* A parent class for block cipher modes that do not require block aligned data to be processed, but can function in
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* a streaming mode.
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*/
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public abstract class StreamBlockCipher
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extends DefaultMultiBlockCipher
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implements StreamCipher
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{
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private final BlockCipher cipher;
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protected StreamBlockCipher(BlockCipher cipher)
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{
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this.cipher = cipher;
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}
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/**
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* return the underlying block cipher that we are wrapping.
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*
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* @return the underlying block cipher that we are wrapping.
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*/
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public BlockCipher getUnderlyingCipher()
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{
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return cipher;
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}
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public final byte returnByte(byte in)
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{
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return calculateByte(in);
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}
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public int processBytes(byte[] in, int inOff, int len, byte[] out, int outOff)
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throws DataLengthException
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{
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if (inOff + len > in.length)
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{
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throw new DataLengthException("input buffer too small");
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}
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if (outOff + len > out.length)
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{
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throw new OutputLengthException("output buffer too short");
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}
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int inStart = inOff;
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int inEnd = inOff + len;
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int outStart = outOff;
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while (inStart < inEnd)
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{
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out[outStart++] = calculateByte(in[inStart++]);
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}
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return len;
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}
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protected abstract byte calculateByte(byte b);
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}
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